公开(公告)号：EP3588806A1

公开(公告)日：2020-01-01

申请号：EP18774323.2

申请日：2018-03-26

申请人： Nippon Telegraph And Telephone Corporation

发明人： OKAMOTO Seiji ,  KISAKA Yoshiaki ,  HORIKOSHI Kengo ,  YOSHIDA Mitsuteru ,  SUZUKI Masahiro

IPC分类号： H04B10/077 ,  H04J11/00

摘要： A signal-to-noise ratio (SNR) estimation method includes an optical signal transmission step of inserting at least one pair of signal sequences into transmission data and transmitting the transmission data into which the at least one pair of signal sequences is inserted, a signal sequence extraction step of extracting the at least one pair of signal sequences from a received signal obtained by receiving the transmitted transmission data, an inner product calculation step of calculating an inner product value of the extracted at least one pair of signal sequences, a reception power calculation step of calculating reception power of the extracted at least one pair of signal sequences, and an SNR calculation step of calculating an SNR of the at least one pair of signal sequences on the basis of the calculated inner product value and the calculated reception power.

公开(公告)号：EP3965319A1

公开(公告)日：2022-03-09

申请号：EP19931946.8

申请日：2019-06-06

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： NAKAMURA Masanori ,  OKAMOTO Seiji ,  HORIKOSHI Kengo ,  YAMAMOTO Shuto ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  TOMIZAWA Masahito

IPC分类号： H04B10/2513 ,  H04B10/61

摘要： An electric digital received signal obtained from a received optical signal is segmented into blocks of a certain length with an overlap of a length determined in advance with an adjacent block. Fourier transformation is performed for each of the blocks. The blocks subjected to the Fourier transformation are stored consecutively in time series, a coefficient determined based on a wavelength dispersion compensation amount according to one of frequency positions and a delay amount according to one of the frequency positions and one of time positions is applied to each of frequency component values included in a plurality of the stored blocks, and the blocks to which the coefficient has been applied and which are obtained by adding up the frequency component values to which the coefficient has been applied for each of the frequency positions are generated. Inverse Fourier transformation is performed on the generated blocks to which the coefficient has been applied. A part of the overlap subjected to the inverse Fourier transformation is removed.

公开(公告)号：EP3367594A1

公开(公告)日：2018-08-29

申请号：EP16857401.0

申请日：2016-10-17

申请人： Nippon Telegraph And Telephone Corporation ,  NTT Electronics Corporation

发明人： HORIKOSHI Kengo ,  YOSHIDA Mitsuteru ,  OKAMOTO Seiji ,  HOSOYA Eiichi ,  YAMAZAKI Etsushi ,  ONUMA Yasuharu ,  TAKAMUKU Tomohiro ,  MIURA Naoki ,  YASUDA Sadayuki

IPC分类号： H04B10/61 ,  H04L27/34

摘要： A coherent optical reception device includes a local oscillation laser that supplies laser light, a coherent optical reception front-end unit that receives a multi-level modulated optical signal, demodulates the optical signal on the basis of the laser light, and converts a demodulated optical signal into an electrical analog signal, an analog-to-digital converter that converts the analog signal into a digital signal, a compensation unit that compensates for an influence of dispersion due to a wavelength or a polarized wave of the optical signal and recovers a carrier phase of the digital signal, a constellation distortion compensation unit that compensates for constellation distortion of the multi-level modulation included in the digital signal in which an influence of dispersion is compensated for by the compensation unit, and an error correction decoding unit that performs error correction of the digital signal in which the constellation distortion is compensated for.

公开(公告)号：EP2942917A1

公开(公告)日：2015-11-11

申请号：EP14752142.1

申请日：2014-02-13

申请人： Nippon Telegraph and Telephone Corporation

发明人： YOSHIDA Mitsuteru ,  YAMAZAKI Etsushi ,  OKAMOTO Seiji ,  UZAWA Hiroyuki ,  HORIKOSHI Kengo ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  TOMIZAWA Masahito ,  FUJIWARA Naoki ,  KATAOKA Tomoyoshi ,  YONENAGA Kazushige

IPC分类号： H04L27/38 ,  H04B10/2507 ,  H04B10/61

CPC分类号： H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

摘要翻译： 抑制电路规模的增加，并补偿在传输路径等中引起的相位变化。 光传输系统包括：导频符号检测单元，其检测间接插入到通过接收的光信号的相干检测获得的接收复电场信号中的多个导频符号; 误差信号计算单元，其基于由导频符号检测单元检测的导频符号和预定的参考符号来计算指示每个导频符号的相位变化的复电场误差信号; 补偿电场信号生成单元，其基于由所述误差信号计算单元计算出的复电场误差信号，使用滤波处理来估计所述接收复电场信号中的导频符号之间的相位变化; 以及相位噪声补偿单元，其基于由补偿电场信号生成单元估计的导频符号之间的相位变化，对接收到的复数电场信号进行相位补偿。

公开(公告)号：EP3512125A1

公开(公告)日：2019-07-17

申请号：EP17864244.3

申请日：2017-10-25

申请人： Nippon Telegraph And Telephone Corporation

发明人： HAMAOKA Fukutaro ,  OKAMOTO Seiji ,  NAKAMURA Masanori ,  HORIKOSHI Kengo ,  KISAKA Yoshiaki

IPC分类号： H04B10/61 ,  H04B3/06 ,  H04B10/2507 ,  H04L27/01

摘要： An optical receiver that demodulates an optical modulation signal into a baseband signal, which is an electrical signal, and decodes a received symbol acquired by converting the baseband signal. The optical receiver includes: an analog-to-digital converter that converts the baseband signal into a digital signal of which the number of samples per received symbol is M/N (samples/symbol), M and N being positive integers, M/N being not an integer, and "M > N" being satisfied; and an adaptive equalization processing unit that executes an equalization operation set in advance to output the received symbol on the basis of the digital signal of which the number of samples per received symbol is M/N (samples/symbol) and a predetermined tap coefficient digital signal equalization tap coefficients used for equalization of a signal, the coefficient being updated in any sampling period.

公开(公告)号：EP3493429A1

公开(公告)日：2019-06-05

申请号：EP17834405.7

申请日：2017-07-26

申请人： Nippon Telegraph And Telephone Corporation

发明人： HORIKOSHI Kengo ,  OKAMOTO Seiji ,  MATSUSHITA Asuka ,  YOSHIDA Mitsuteru ,  HAMAOKA Fukutaro ,  YAMADA Yoshiaki ,  KISAKA Yoshiaki

IPC分类号： H04B10/077 ,  H04B1/707 ,  H04B10/516 ,  H04J14/08

摘要： An optical transmitter of an optical data transmission system transmitting data through an optical fiber transmission path includes a main signal generator that converts first transmission data into a predetermined signal format to generate a first signal, a DCSK modulator that DCSK-modulates second transmission data to generate a second signal, a signal-multiplexer that performs time-division multiplexing of the first signal and the second signal, and an electro-optical converter that converts a multiplexed signal obtained by the time-division multiplexing of the signal-multiplexer from an electric signal into an optical signal, and outputs the optical signal to the optical fiber transmission path.

公开(公告)号：EP3996297A1

公开(公告)日：2022-05-11

申请号：EP19946112.0

申请日：2019-09-17

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： HORIKOSHI Kengo ,  NAKAMURA Masanori ,  OKAMOTO Seiji ,  NISHIZAWA Hideki ,  YAMAZAKI Etsushi

IPC分类号： H04B10/2569 ,  H04B10/61

摘要： A signal processing apparatus includes: a coefficient update unit configured to approximate a characteristic of a transmission line of an optical signal by a first tap coefficient vector of which an L0 norm is a predetermined value or less; a zeroing unit configured to generate a second tap coefficient vector by replacing, with 0, a tap coefficient of which an absolute value is less than a threshold among tap coefficients of the first tap coefficient vector; and an adaptive filter configured to perform, based on the second tap coefficient vector, adaptive equalization processing on a digital signal corresponding to an optical signal received via the transmission line ( Figure 2 ).

公开(公告)号：EP2942917B1

公开(公告)日：2018-05-23

申请号：EP14752142.1

申请日：2014-02-13

申请人： Nippon Telegraph and Telephone Corporation

发明人： YOSHIDA Mitsuteru ,  YAMAZAKI Etsushi ,  OKAMOTO Seiji ,  UZAWA Hiroyuki ,  HORIKOSHI Kengo ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  TOMIZAWA Masahito ,  FUJIWARA Naoki ,  KATAOKA Tomoyoshi ,  YONENAGA Kazushige

IPC分类号： H04L27/38 ,  H04B10/2507 ,  H04B10/61

CPC分类号： H04B10/6165 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/61 ,  H04J14/06 ,  H04L27/38 ,  H04L2027/0067 ,  H04L2027/0095

摘要： An increase in circuit scale is suppressed and a phase variation caused in a transmission path or the like is compensated for. An optical transmission system includes: a pilot symbol detection unit which detects a plurality of pilot symbols intermittently inserted into a received complex electric field signal that is obtained through coherent detection for a received optical signal; an error signal computation unit which calculates a complex electric field error signal indicating a phase variation at each pilot symbol based on the pilot symbols detected by the pilot symbol detection unit and a predetermined reference symbol; a compensation electric field signal generation unit which estimates a phase variation between the pilot symbols in the received complex electric field signal using filter processing based on the complex electric field error signal calculated by the error signal computation unit; and a phase noise compensation unit which performs phase compensation for the received complex electric field signal based on the phase variation between the pilot symbols estimated by the compensation electric field signal generation unit.

公开(公告)号：EP2930864B1

公开(公告)日：2017-08-16

申请号：EP14740258.0

申请日：2014-01-15

申请人： Nippon Telegraph and Telephone Corporation

发明人： ISHIHARA Koichi ,  MIZOGUCHI Masato ,  MURAKAMI Tomoki ,  KATAOKA Tomoyoshi ,  KISAKA Yoshiaki ,  NAKAGAWA Tadao ,  YAMAZAKI Etsushi ,  OKAMOTO Seiji ,  HORIKOSHI Kengo ,  TOMIZAWA Masahito ,  KUDO Riichi

IPC分类号： H04B10/61 ,  H04B10/2513 ,  H04J3/14 ,  H04B10/69

CPC分类号： H04J14/08 ,  H04B10/0775 ,  H04B10/2513 ,  H04B10/25133 ,  H04B10/516 ,  H04B10/61 ,  H04B10/6161 ,  H04B10/697 ,  H04B2210/072 ,  H04J3/14

公开(公告)号：EP2930867A1

公开(公告)日：2015-10-14

申请号：EP14742856.9

申请日：2014-01-24

申请人： Nippon Telegraph and Telephone Corporation

发明人： HORIKOSHI Kengo ,  SHIBAHARA Kohki ,  YAMAZAKI Etsushi ,  YOSHIDA Mitsuteru ,  ISHIHARA Koichi ,  KOBAYASHI Takayuki ,  KISAKA Yoshiaki ,  OHARA Takuya ,  TOMIZAWA Masahito ,  KATAOKA Tomoyoshi

IPC分类号： H04B10/61

CPC分类号： H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

摘要： An optical receiving device receives an optical signal that has been modulated by means of phase modulation or quadrature amplitude modulation, converts the received optical signal into an electrical signal using coherent detection, and performs phase compensation on the converted received signal, and includes: a carrier phase estimation unit that estimates carrier phase errors in a received symbol string obtained from the received signal; a gain adjustment unit that performs gain adjustment on symbols input into the carrier phase adjustment unit; a phase cycle slip reduction unit that, by performing statistical processing on an output from the carrier phase estimation unit, detects general noise that causes a phase cycle slip, and reduces the phase cycle slip; and a phase compensation circuit that compensates carrier phase errors contained in the received signal using an output from the carrier phase estimation unit.